Level 15
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Retirement tax questions

Yes, clicking the Continue button on the Your 1099-R Entries page will get you to the same place.  I mentioned the going through the Deductions & Credits section because that will work even if you have no Forms 1099-R to enter.

Your adjustment to basis needs to be reported with the first Form 8606 Part I you are required to file after you acquired the basis.  Since you acquired the basis in 2016, as long as you took no traditional IRA distribution in 2016 and made no nondeductible traditional IRA contributions for 2016, no 2016 Form 8606 was required.  If you similarly took no traditional IRA distribution in 2017 and made no nondeductible traditional IRA contributions for 2017, no 2017 Form 8606 was required either and you'll continue to wait to report the adjustment until you do have reason to file Form 8606 Part I.